Hi all - I work at Webnames and I can tell you that .tel is not a social networking utility. It is supremely boring and supremely useful. It holds contact data - that's it.
Think of it as your online business card. It's most useful on a mobile phone as you don't have to wade through website info to find "contact us".
Webnames has a blog called aboutdottel.com - it's got lots of ideas on the uses of a .tel